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AS/NZS 3500.1:2021


Plumbing and drainage, Part 1: Water services

Specifies requirements for the design, installation and commissioning of cold water services from a point of connection to the points of discharge, and for non-drinking water from a point of connection to the points of discharge. It applies to new installations as well as alterations, additions and repairs to existing installations. KEYWORDS: Plumbing; Drainage; Water service
Published: 28/05/2021
Pages: 117
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Application
1.2.1 Australia
1.2.2 New Zealand
1.3 Normative references
1.4 Terms and definitions
1.5 Abbreviations
1.6 Equivalent pipe sizes
1.7 Facilities for people with disabilities
1.8 Termite management
2 Materials and products
2.1 Scope of section
2.2 General
2.3 Pipes and fittings — General limitations
2.4 Metallic pipes and fittings
2.4.1 Cold water services
2.4.2 Firefighting water services
2.4.3 Limitations
2.5 Plastics pipes and fittings
2.5.1 Cold water service
2.5.2 Firefighting water services
2.5.3 Limitations
2.6 Safe-tray materials
2.7 Joints
2.7.1 Flanged joints
2.7.2 Elastomeric seals
2.7.3 Silver brazing alloy Copper and copper alloys Stainless steels
2.7.4 Solvent cement and priming fluid
2.7.5 Filler rods for stainless steel joints
2.8 Miscellaneous materials
2.8.1 Concrete mix
2.8.2 Cement mortar
2.8.3 Water for concrete and mortar
2.8.4 Timber Timber in Australia Timber in New Zealand
2.8.5 External protective coatings
2.8.6 Marking tape
3 Sizing of water services
3.1 Scope of section
3.2 Flow requirements
3.2.1 Flow rates
3.2.2 Loading units
3.2.3 Probable simultaneous demand
3.2.4 Probable simultaneous flow rates
3.3 Pressure requirements
3.3.1 Available pressure
3.3.2 Pressure at outlets
3.3.3 Pressure losses
3.3.4 Maximum pressure within buildings
3.3.5 Availability of water supply
3.4 Velocity requirements
3.5 Pipe size limitations
3.5.1 Water service
3.5.2 Branch offtakes
4 Cross-connection control and backflow prevention
4.1 Scope of section
4.2 Protection of water supplies
4.2.1 Design
4.2.2 Protection against contaminants
4.2.3 Combined tanks
4.2.4 Alternative water supplies
4.2.5 Integral backflow prevention
4.3 Cross-connection hazard rating
4.4 Provision of backflow prevention devices
4.4.1 General
4.4.2 Type of backflow protection
4.4.3 Hose taps
4.4.4 Additional backflow protection
4.4.5 Water downstream of backflow prevention device
4.4.6 Commissioning
4.4.7 Heated water systems
4.5 Suitability of devices for hazards
4.6 Installation of backflow prevention devices
4.6.1 General installation requirements
4.6.2 Location of devices General Accessibility Drainage and leakage
4.6.3 Specific installation requirements for testable and non-testable devices General Testable devices Non-testable devices
5 Installation of cold water services
5.1 Scope of section
5.2 Installation of pipes and fittings
5.2.1 Copper pipes and fittings
5.2.2 Plastics pipes and fittings Installation of PVC pipe systems Installation of ABS pipe systems Installation of PE pipe systems Installation of other plastics pipe systems
5.3 Proximity to other services
5.3.1 General
5.3.2 Above-ground services
5.3.3 Below-ground services Electrical Gas Communication services Stormwater and sanitary drainage Non-drinking water Other services
5.3.4 Crossover of underground services
5.3.5 Clearance from underground obstructions
5.4 Isolating valves
5.4.1 General
5.4.2 Location
5.4.3 On fire services
5.4.4 Multiple dwellings
5.4.5 Maintenance
5.5 Location of piping
5.5.1 Location
5.5.2 Concealed piping Walls
5.5.3 Chases, ducts or conduits
5.5.4 Under concrete slabs
5.6 Methods of jointing
5.6.1 General
5.6.2 Threading
5.6.3 Bolted gland and Gibault-type joints
5.6.4 Jointing of copper and copper alloy pipes
5.6.5 Compression joints
5.6.6 Flanged joints
5.6.7 Roll-grooved joints
5.6.8 Silver brazing Joints Taps and valves
5.6.9 Jointing of plastics pipes PVC PE ABS Other plastics pipes
5.6.10 Jointing of stainless-steel pipe and fittings Jointing of piping up to and including DN 25 Jointing of piping larger than DN 25
5.6.11 Jointing of dissimilar metallic pipes and fittings below ground
5.7 Support and fixing above ground
5.7.1 General
5.7.2 Brackets, clips and hangers
5.7.3 Limitations of pipe supports
5.7.4 Spacing
5.7.5 Securing of pipes and fittings
5.8 Standpipes
5.9 Anchorage below ground
5.9.1 General
5.9.2 Location of thrust blocks
5.9.3 Construction of thrust blocks
5.10 Depth of cover
5.11 Bedding and backfill
5.12 Installation in contaminated areas
5.13 Corrosive areas
5.14 Pipes in water-charged or filled ground
5.15 Open channels or watercourses
5.16 Private easements
5.16.1 Proximity of water services
5.16.2 Depth of piping
5.17 Dry services
5.18 Protection against freezing
5.18.1 General
5.18.2 Piping located outside buildings
5.18.3 Pipes located on metal roofs
5.18.4 Pipes located inside buildings General Pipes in unheated roof spaces Pipes adjacent to external walls
5.18.5 Insulation of piping
5.19 Identification of piping
5.20 Temperature control devices
5.21 Australian bushfire prone areas
6 Fire services
6.1 Scope of section
6.2 Materials and products
6.3 Installation
6.4 Water storage tanks
6.5 Identification
7 Irrigation and lawn watering systems
7.1 Scope of section
7.2 System types
7.3 Backflow protection requirements
7.4 Materials
8 Water storage tanks
8.1 Scope of section
8.2 Purpose of tanks
8.2.1 General
8.2.2 Limitations on use
8.3 Design and installation requirements
8.3.1 General
8.3.2 Capacity of storage tanks — Measurement
8.3.3 Access
8.3.4 Placement of tank Safe-tray Limitations on location of drinking water tanks
8.4 Tank design
8.4.1 General
8.4.2 Internal corrosion protection
8.4.3 Tank cover
8.4.4 Tank overflow General Discharge of overflow Discharge not readily visible Size of air gap
8.5 Inlet piping
8.5.1 Connections
8.5.2 Stop valve
8.6 Outlet piping
8.6.1 Connections
8.6.2 Service outlets
8.7 Sludge valves
8.8 Safe-tray
8.8.1 General
8.8.2 Safe-tray construction
8.8.3 Overflow
8.9 Marking of tanks
9 Non-drinking water services
9.1 Scope of section
9.2 Materials and products
9.2.1 General
9.2.2 Water meters
9.3 Installation requirements
9.3.1 Installation
9.3.2 Proximity to other services Above-ground installations Below-ground installations
9.4 Cross-connection control
9.5 Temporary bypass
9.6 Identification of non-drinking water services
9.6.1 Colour of non-drinking water pipework
9.6.2 Marking of non-drinking water pipework
9.6.3 Identification of buried non-drinking water services
9.6.4 Installation of underground marking tape
9.7 Non-drinking water outlets
9.7.1 External non-drinking hose tap outlets
9.7.2 Identification of all non-drinking water outlets
9.8 Testing and commissioning a non-drinking water service
9.8.1 Flushing and testing
9.8.2 Commissioning a non-drinking water service
10 Treated greywater services
10.1 Scope of section
10.2 Materials and products
10.3 Cross-connection control
10.4 Installation
11 Water for sanitary flushing
11.1 Scope of section
11.2 General
11.3 Water closet
11.4 Urinals
11.5 Installation of cisterns
11.5.1 General
11.5.2 Urinal type cisterns
11.5.3 Manually operated cisterns
11.5.4 Water closet pan and slop hopper pan type cisterns
11.6 Flush valves supplied from break tanks
11.6.1 General
11.6.2 Capacity
11.6.3 Operating head
11.6.4 Pipe size guide
11.6.5 Urinal flush valves
11.7 Flush pipes and water flow distribution
11.8 Pressure ratio valves
11.8.1 General
11.8.2 Requirement for pressure gauges
11.9 Flush valves connected to the drinking water service
11.9.1 General
11.9.2 Compatibility
11.9.3 Pipe size
11.9.4 Protection
11.9.5 Location
11.9.6 Pressure and velocity limitations
11.9.7 Branch service pipe
12 Pumps
12.1 Scope of section
12.2 General
12.3 Control of pumps
12.4 Installation of pumps
12.5 Booster pumps
13 Water requirements for haemodialysis machines
13.1 Scope of section
13.2 Connection to the water service
13.3 Maintenance of flow rate
13.4 Water meters
14 Property water meters
14.1 Scope of section
14.2 Location of water meters
14.3 Installation inside buildings
14.4 Installation below ground
14.5 Protection from mechanical damage
14.6 Frost protection
15 Installation of water supply system from rainwater tanks
15.1 Scope of section
15.2 Pipes, valves and fittings
15.3 Installation
15.3.1 General
15.3.2 Additional marking and signage of pipework and outlets Pipework Water outlets
15.3.3 Connection between service pipes
15.4 Testing and commissioning a rainwater system
15.4.1 Flushing and testing
15.4.2 Commissioning a rainwater system
16 Multi-unit developments
16.1 Scope of section
16.2 Methods of design and installation
16.3 Division of development
16.4 Ring mains and flushing points
16.5 Fire services
17 Testing and commissioning
17.1 Scope of section
17.2 Flushing
17.3 Testing
17.3.1 Hydrostatic test
17.3.2 Storage tanks (except rainwater tanks)
17.4 Cleaning and disinfection of drinking water storage tanks
17.5 Disinfection of water services
17.6 Commissioning
Appendix A
Appendix B
B.1 General
B.2 Australia
B.3 New Zealand
Appendix C
C.1 General
C.2 Procedure
C.3 Worked example
Appendix D
D.1 General
D.2 Procedure
D.3 Worked example
Appendix E
E.1 Scope
E.2 Potential cross-connections
Appendix F
F.1 General
F.2 Inflow rate
F.3 Overflow size and spilling level
F.4 Air gap
F.5 Height of inlet above invert level of overflow
Appendix G
G.1 General
G.2 Cleaning
G.3 Disinfection
Appendix H
H.1 General
H.2 Precautions against contamination
H.3 Flushing of water services
H.4 Chlorination
H.5 Final flushing
Amendment control sheet
AS/NZS 3500.1:2021
Amendment No. 1 (May 2022)
Correction amendment
Appendix Former Wording
FMR.1 Purpose of this Appendix
FMR.2 Former wording texts and notes
Former Clause 2.2 Former Clause 2.2 Former Wording
Former Clause Clause New Note
Cited references in this standard
ASME B36.19M
Stainless Steel Pipe
Disinfecting Water Mains
NZS 5807
Code of practice for industrial identification by colour, wording or other coding
NZS 4219
Seismic performance of engineering systems in buildings
Installation of ABS pipe systems
Content history
[Available Superseded]
[Available Superseded]
[Available Superseded]
DR AS/NZS 3500.1:2020
Inclusive of GST
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